That's your opinion... You rate the dog alerts and statement discrepancies as significant.. I dont... And as the parents, aren't suspects I don't think either police force does
I disagree.
The dogs alerts, even in their flimsiest form, don't jive with the official narrative. So 'significant', to coin your phrase means, in this case, incongruent. So the police, given their expertise in such matters, will also know that the dog alerts are at odds with the theory of an abduction.
Whether anyone puts any store in the circumstantial evidence provided by the dogs, and, let's never forget that 1. that's what they were brought in for, and 2. I doubt anybody expected them to 'find' anything, any investigation has to somehow square that circle.
In addition, it is a product of the failings on the part of a number of parties, in collection and analysis of the forensic evidence and the failure to adequately preserve the scene (and the obvious fact that she's still missing), why the mystery prevails.